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I put the target library in Master (computer A) and linked against it from my catkin package in also A. In B, I didn't do any special thing. I only connected it to Master (A) via ROS net. But when I run rosrun command to run the main node of catkin package in computer A I receive this error:

Info: Initializing EtherCAT on eth0 with communication thread Warning: No EtherCAT slaves found! Info: Done.